Black cotton soil is weak soil, possessing undesirable characteristics like shrinkage and swelling. Before undertaking any civil engineering project on such land, it must be rehabilitated before construction. Various work has been done by researchers to overcome these problems by using different types of soil stabilization, such as cement soil stabilization, lime soil stabilization, bitumen soil stabilization, etc. The present study includes the determination of the geotechnical properties of soil obtained from Lalitpur, Uttar Pradesh, and coir fiber (% of black cotton soil samples) in terms of soil strength.